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18,121 had already suffered from Small Pox.
63,654 bad been twice vaccinated.
186,622 had been once vaccinated.
5,715 had never been vaccinated.
For the purposes of comparison these sections may be
regarded as separate populations. Living together, intermingled
in the same town, they enjoyed the same advantages
from sanitation, and were exposed to similar influences of infection.
It is interesting to notice whether or no Small Pox
attacked the several sections with an equal degree of severity,
especially having reference to those which differ from each
other in regard to the presence or absence of the protective
influence afforded by vaccination. To illustrate this point
the disease rate which actually occurred is appended to the
description of each section.
The section every member of which had already suffered
from Small Pox, for every thousand of its population had 1.3
individuals attacked. The twice vaccinated section, for
every thousand of its population had 3 individuals attacked.
The once vaccinated section, for every thousand of its
population had 19 individuals attacked. The unvaccinated
section, for every thousand of its population had 94
individuals attacked.
These figures speak for themselves. In the presence of an
epidemic, we observe Small Pox tracking out and decimating
that portion of the population unprotected either by vaccination
or previous attack.
Let us now observe what effect the dissimilarity existing
between the sections in regard to protective influence has
upon the relative death rate. The section every member of
which had already suffered from Small Pox lost 3 persons by